Chapter 9: Standard welding symbol

Introduction

Blueprints or drawing of final products are provided to worker or welders before the welding jobs starts. Welder studies the blueprints and plans according to it. There are standard symbols used in welding industry to make the similar understanding about any task. The main elements of welding symbols are:

  1. Reference line

  2. Arrow

  3. Basic weld symbol

  4. Dimension and other data

  5. Finish symbol

  6. Tail

  7. Supplementary symbol

  8. Specification, process or other symbol




Standard location of welding symbol element

Welding symbols have their standard location to ease welder from complexity of design. The figure with symbol on standard location is shown below. From the given figure we can get following information:

  1. Type of joint

  2. Position of joint

  3. No of weld

  4. Method of welding

  5. Edge preparation

  6. Requirement of full or partial welding

  7. Size and depth of the bead

  8. Length of the weld

  9. Further direction and so on.



Image showing Standard location of welding symbol element



Basic welding symbol

Location Significance

Arrow side

Other side

Both side

Fillet

 ../_images/9-1-a.png ../_images/9-1-b.png ../_images/9-1-c.png

Plug or Slot

 ../_images/9-2-a.png ../_images/9-2-b.png

Not used

Spot or Projection

 ../_images/9-3-a.png ../_images/9-3-b.png

Not used

Stud

 ../_images/9-4-a.png

Not used

Not used

Back

 ../_images/9-5-a.png ../_images/9-5-b.png

Not used

Surfacing

 ../_images/9-6-a.png

Not used

Not used

Edge

 ../_images/9-7-a.png ../_images/9-7-b.png ../_images/9-7-c.png

Seam

 ../_images/9-8-a.png ../_images/9-8-b.png

Not used


Symbols for different groove according to location signification is given below:


Location Significance

Arrow side

Other side

Both side

Square

 ../_images/9-9-a.png ../_images/9-9-b.png ../_images/9-9-c.png

V

 ../_images/9-10-a.png ../_images/9-10-b.png ../_images/9-10-c.png

Bevel

 ../_images/9-11-a.png ../_images/9-11-b.png ../_images/9-11-c.png

U

 ../_images/9-12-a.png ../_images/9-12-b.png ../_images/9-12-c.png

J

 ../_images/9-13-a.png ../_images/9-13-b.png ../_images/9-13-c.png

Flare - V

 ../_images/9-14-a.png ../_images/9-14-b.png ../_images/9-14-c.png

Flare - Bevel

 ../_images/9-15-a.png ../_images/9-15-b.png ../_images/9-15-c.png

Scarf for Brazed joint

 ../_images/9-16-a.png ../_images/9-16-b.png ../_images/9-16-c.png


Example of a welding symbol for a fillet weld

Image showing welding symbol for a fillet weld

The given information is shown in the drawing below:

Image showing above information


Supplementary symbol


S/n

Description

Other side

Weld all around

 ../_images/99-1.png

Field weld

 ../_images/99-2.png

Melt through

 ../_images/99-3.png

Concave contour

 ../_images/99-4.png

Convex contour

 ../_images/99-5.png

Flush contour

 ../_images/99-6.png

Backing (rectangle)

 ../_images/99-7.png

Spacer (rectangle)

 ../_images/99-8.png

Consumable inert (square)

 ../_images/99-9.png

Some of the implementations are shown below:

Image showing convex contour

Image showing Flat contour

Image showing concave contour

Image showing concave contour by grinding



Importance of position of arrow

While preparing the drawing or blueprint of welding with standard symbols, an arrow should touch the location where welding is required. A location touched by arrow is known as arrow side. A position of arrow as symbol in left side and its implementation in right side is shown in figures below:

Image showing filled weld, arrow side

Image showing filled weld, other side

Image showing filled weld, both sides

What’s next?

This will be the end of our journery. To dive deep in the welding field there are lots of resouces available…